William h



(No Model.)

W. H. WOR-THEN.

PISTON FOR COMPRESSOR AND OTHER PUMPS AND ENGINES. No. 311,629.

Patented Feb. 3, 1 885..

NITED TATBS ATENT FFICEQ WILLIAM H. WORTHEN, or BROOKLYN, NEW YORK,ASSIGNOR TO GUILD & GARRISON, or SAME PLACE.

PISTON FOR COMPRESSOR AND OTHER PUMPS AND ENGINES.

SPECIFICATION forming part of Letters Patent No. 311,629, dated February3, 1885.

Application filed March 31, 1894.

T (LZZ whom it may concern:

Be it known that I, WILLIAM H.\VORTHEN, of the city of Brooklyn, in thecounty of Kings and State of New York, have invented a new and usefulImprovement in Pistons for Oompressors and other Pumps and Engines, ofwhich the following is a specification.

My invention is applicable generally to pumps and engines, but isparticularly intended for the pistons of air and gas compressors.

In dry'compressors it is necessary that there should be as littleclearance as possible at each end of the stroke,and that the back end aswell as the front end of the piston should be as nearly as possible aplane surface without projections or depressions. Any projection fromthe back end of the piston necessitates a cor responding depression orcavity in the cylinder-head, and depressions or cavities in the head aswell as those in the piston form airspaces,which impair the efficiencyof the pump or compressor by reason of the expansion of the compressedair or gas with which they are fitted at each change of piston-stroke.

In carrying out my invention I employ a piston composed, principally,ofa body and a follower,between which are held the packingrings, and whichis secured by screws to the body, and the piston-rod is formed with ataper fitting a taper socket in the piston-body, and is secured in thepistoirbody by a nut which is preferably cylindric externally, andreceived in a cylindric countersink or recess in the piston-body.

This invention consists in novel combinations of parts, which areparticularly hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is an axial section of a pistonembodying my invention, and Fig. 2 is a plan View thereof.

Similar letters of reference designate corresponding parts in bothfigures.

A designates the piston-body, having at the front end the flange a, andB designates the follower,also having a flange, 6/.

O are packing-rings of any Well-known or (No model.)

suitable construction,which are held between the flanges a a of thepiston'body and follower A B.

At the back end of the piston-body A is a hub or projection, 1), withinwhich is formed a circular countersink, c, and the follower B has acircular central aperture snugly fitting the exterior of said hub orprojection b in a well-known manner.

D designates the piston rod, having ataper portion, D, which fits ataper socket, d,in the piston-body A and forms a slight shoulder,e. Thetaper portion Dof the rod extends nearly but not quite to the bottom ofthe countersink c, and beyond that point the rod has a screwthread, f,on which is fitted a circular nut, E, which is snugly received in thecountersink c.

In said nut E are holes g,with which a Wrench having projecting studs orspurs may be engaged.

In the face of the follower B is formed a large countersink, h, which isof such depth that the end of the hub or projection b and 7c the outerface of the nut E Will be approximately fiush with the bottom of thecountersink, and within the circle or circumference of this countersinkare arranged the screws 2', whereby the follower B is secured to thepiston-body A. The heads 1" of these screws are fitted in minorcountersinksj in the bottom of the main countersink h, and the heads areflush with the bottom of said main countersink h.

F designates the guard-plate, which is of a thickness corresponding tothe depth of the main countersink h, and'is snugly fitted therein, theinner face of the guard-plate being in close proximity to or bearingagainst the screwheads 1" and the outer face of the nut E. Theguard-plate F is provided with a central aperture, k,which receives theend of the pistonrod D through it, and is secured in place by a pin orkey, 1, passing through the rod D just outside the guard-plate.

The aperture 70 in the guard-plate F may be large enough to slip overthe threaded end f ofthe piston-rod; but preferably said aperture isscrew threaded, and the guard plate is screwed upon the rod, thussecuring it in place 95 in addition to the pin Z.

It will be seen from the foregoing descrip tion that the screws 73 andnut E cannot move outward relatively to the guard-plate F, because oftheir close proximity to the inner face I00 thereof, and asthe turningof said screws and nut in loosening would necessarily result in suchoutward movement it will be clear that they are securely locked againstunscrewing.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination, with apiston-body,A, and a iollower, B, havingcountersinksj in its outer face, of screws 1', inserted through thefollower and into the body, and having their heads '5 fitting thecountersinks j in said follower, anda guardplate secured at the back ofthe piston and covering the heads of said screws. substantially as andfor the purpose herein described.

2. The combination. with a piston-body,A, and a follower, B, having inits outer face a main countersink, h, and minor countersinks j in thebottom of said main countersink, of

screws i, inserted through the follower and into said body, and, havingtheir heads 1' fitting the minor countersinks j, and a guardplate, F,secured in said countersink h, and

covering said screws, substantially as and for s the purpose hereindescribed.

3. The combination, with the' piston-body having the countersinkc, and arod, D, having a screw-threaded end, f, of a nut, E,upon said rod,fitting the countersink c in said body, a follower, B,havin'g thecountersin ks j,screws i, inserted through the follower and into thebody, and having their heads z" fitting said countersinks j, and aguard-plate secured at the back of the piston and covering said nut andscrews, substantially as and for the purpose herein described.

4. The combination, with the body A, having the hub or projection 12 andcountersink c, of the rod D D f, the nut' E, the follower B, having themain and minor countersinks h j, the screws M, and the guard-plate F,all substantially as and for the purpose herein described.

WM. H. WORTH N Witnesses: 'W. R. LYNCH,

